| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that when a conventional stamp ink is stamped onto an image formed on a recording medium so as to make the image invisible, the image seems temporarily as if it has been made invisible, but the image appears gradually and is seen through the ink. <P>SOLUTION: A stamp ink is a stamp ink for making an image formed on a recording medium invisible, does not include silicone oil, butyral resin and a resin whose solubility in water and ethanol at 25°C is ≤7%, and uses a black dye and carbon black together as a color material. A good stamp ink can be provided which when stamped onto an image and dried (fixed), achieves the phenomenon that the image is not seen at all and is made sufficiently invisible, unlike conventional stamp inks. <P>COPYRIGHT: (C)2012,JPO&INPIT |
